56 entries under adjective topic. ×

1
imprudent
1
inconsiderate
1
indiscreet
1
irresponsible
1
lazy
1
mindless
1
remiss
1
undiscerning
1
unguarded
1
unprepared
1
unthinking
1
unwatchful(careless, concerned, unobservant)
0
absent-minded
0
accidental
0
carefree
0
casual
0
drowsy
0
easygoing
0
frivolous
0
harebrained
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APASmart Define. (2016). observant thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/observant/thesaurus/antonyms
ChicagoSmart Define. 2016. "observant thesaurus" https://smartdefine.org/observant/thesaurus/antonyms (accessed September 27, 2026).
HarvardSmart Define 2016, observant thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/observant/thesaurus/antonyms>.
MLASmart Define. "observant thesaurus" 29 March 2016. Web. 27 September 2026. <https://smartdefine.org/observant/thesaurus/antonyms>